Starting from Android 6.0, there have been some changes on how and where downloaded apps and their data can be stored.
Phone storage
This is the internal storage which contains the Android system, preinstalled apps, email, text messages, and cached data from the apps. You can also install apps that you've downloaded and capture photos, videos, and screenshots to this storage.
Storage card
Use your storage card as a removable storage to store and access your media and other files on HTC U11 life or any Android phone.
USB storage
You can plug in an external USB storage device such as a USB flash drive or an SD card reader.
You need a special cable to connect
HTC U11 life and a USB storage device.